When you design a network, when would it be required to leak routes into a Level 1 area?

When you design a network, when would it be required to leak routes into a Level 1 area?
A . when a multicast RP is configured in the nonbackbone area
B . when MPLS L3VPN PE devices are configured in the Level 1 areas
C . when equal cost load balancing is required between the backbone and nonbackbone areas
D . when unequal cost load balancing is required between the backbone and nonbackbone areas

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Answer: B